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AUSCERT External Security Bulletin Redistribution
ESB-2020.0601
USN-4289-1: Squid vulnerabilities
21 February 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Squid
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-8517 CVE-2020-8450 CVE-2020-8449
CVE-2019-12528
Original Bulletin:
https://usn.ubuntu.com/4289-1/
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running Squid check for an updated version of the software for their
operating system.
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USN-4289-1: Squid vulnerabilities
20 February 2020
squid, squid3 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
Several security issues were fixed in Squid.
Software Description
o squid - Web proxy cache server
o squid3 - Web proxy cache server
Details
Jeriko One discovered that Squid incorrectly handled memory when connected to
an FTP server. A remote attacker could possibly use this issue to obtain
sensitive information from Squid memory. (CVE-2019-12528)
Regis Leroy discovered that Squid incorrectly handled certain HTTP requests. A
remote attacker could possibly use this issue to access server resources
prohibited by earlier security filters. (CVE-2020-8449)
Guido Vranken discovered that Squid incorrectly handled certain buffer
operations when acting as a reverse proxy. A remote attacker could use this
issue to cause Squid to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2020-8450)
Aaron Costello discovered that Squid incorrectly handled certain NTLM
authentication credentials. A remote attacker could possibly use this issue to
cause Squid to crash, resulting in a denial of service. (CVE-2020-8517)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 19.10
squid - 4.8-1ubuntu2.2
Ubuntu 18.04 LTS
squid - 3.5.27-1ubuntu1.5
Ubuntu 16.04 LTS
squid - 3.5.12-1ubuntu7.10
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
In general, a standard system update will make all the necessary changes.
References
o CVE-2019-12528
o CVE-2020-8449
o CVE-2020-8450
o CVE-2020-8517
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